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Wu Y.-L.,China Academy of Safety Science and Technology | Chen J.,China Academy of Safety Science and Technology | Zeng S.-M.,Sichuan Coal Industry Group Ltd Liability Company
Procedia Engineering | Year: 2011

The acoustic emission technique is used to research the deformation and the failure process, investigate the deformation and injury regularity, discuss the physical process of acoustic emission of the coal and gas outburst and reveal the evolution process and disaster mechanism of the coal rock dynamic disaster. In this paper, the relationship between the damage and the acoustic emission is researched to get the coal cock damage expression which is expressed by the acoustic emission cumulative value. Meanwhile, the quasi-static is used to analyze the evolution process of the coal rock's inner damage and describe the coal rock's single axis damage character. On the base of the coal rock unit damage model, the constitutive relationship of acoustic emission coal rock is studied, which is the theory analysis for the coal and gas outburst. It is very significant for the research of the coal and gas outburst mechanism and prediction. © 2011 Published by Elsevier Ltd. Source


Lin H.,University of Science and Technology Beijing | Lin H.,Key Laboratory of the Ministry of Education of China for High Efficient Mining and Safety of Metal Mines | Wang Y.-N.,University of Science and Technology Beijing | Wang Y.-N.,Key Laboratory of the Ministry of Education of China for High Efficient Mining and Safety of Metal Mines | And 3 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2012

In order to eliminate hidden danger caused by H2S in the coal mine, Fenton reagent was used to treat H2S in the mine water. In this study, the effects of H2O2 dosage, FeSO4·7H2O dosage, pH, reaction time, rotation speed, reaction temperature on the treatment efficiency were researched. In addition, the study investigated the kinetics of removing hydrogen sulfide using Fenton reagent. The results show that the optimum dosage of Fenton reagent is 0.67 g/L FeSO4·7H2O+0.67 mL/L H2O2, the suitable pH is 6-10, the optimum flow disturbance intensity is 160 r/min of bed rotation speed, and 25 °C for 10 min. Under optimal conditions, when the initial concentration of hydrogen sulfide is 140 mg/L, the removal rate of hydrogen sulfide can reach 93.14% and the concentration of residual hydrogen sulfide in water is only 2.381 mg/L. The process of the removing reaction of H2S by Fenton reagent can be described to be the quasi-second order kinetics. Source


Lin H.,University of Science and Technology Beijing | Wei W.,University of Science and Technology Beijing | Wang Y.-N.,University of Science and Technology Beijing | Yu Y.-J.,Sichuan Coal Industry Group Ltd Liability Company
Meitan Xuebao/Journal of the China Coal Society | Year: 2012

Laboratory tests were carried out to select the optimal adsorbent to remove hydrogen sulfide in coal mine by sprinkling it into atmosphere. Characteristics of different adsorbents were investigated. The results show that Sodium carbonate shows a good initial hydrogen sulfide adsorption capability; however, the adsorption tail liquid is unstable that hydrogen sulfide can be readily emitted into atmosphere due to agitation or dilution; hydrogen sulfide is able to be oxidized into sulfur by adding an oxidant (NT) into the adsorption liquid, thus, hydrogen sulfide is removed from atmosphere instantaneously; in order to remove coal adhesive hydrogen sulfide, surfactant is added into absorbent to reduce the surface tension of absorbent and expand permeation radius, thus increases the removal efficiency of internal hydrogen sulfide within coal. Source


Zhang G.-F.,China University of Mining and Technology | Liu Z.-S.,China University of Mining and Technology | Chen X.-K.,Sichuan Coal Industry Group Ltd Liability Company | Wang Y.-W.,China University of Mining and Technology | Xie Y.,China University of Mining and Technology
Yantu Lixue/Rock and Soil Mechanics | Year: 2014

The most of construction coal mines in South of Sichuan province have been discovered with the difficult problems of much soft surrounding rock, easily weathering, developmental joint and fracture, large deformation, difficult support, multiple repairmen, which have influenced on the process of coal exploration and production in recent years. The soft style and severity should be conformed in order to choose the appropriate support technology. We investigated the engineering geology and choose the thick-bedded dark grey mud rock mainly surrounding the roadway. The fresh rocks with irregular shape have been tested by the point load testing in tunnel. After the screening testing data with the method of Grubbs criterion, the rock strength has been calculated by the formula defined by the traditional method, International Society for Rock Mechanics (ISRM) standard rate and Chinese engineering standard specification. The random and system error about the result of calculation with different formulas is tested by the F-test and t-test. The results show that the average uniaxial compressive strength obtained by the traditional method and ISRM standard rate is more accuracy than the Chinese engineering standard specification. The strength is appropriate to the soft rock evaluation. The change factor of the mudstone strength is between 11%-30%, which is approach to the general uniaxial compressive strength. The point load testing is the credibility, fast, convenience and cheap way to obtain the strength of soft rock with difficult coring, which could be used to evaluate the difficulty of the soft rock engineering. Source


Wu Y.,China Academy of Safety Science and Technology | Liu H.,China Academy of Safety Science and Technology | Zeng S.,Sichuan Coal Industry Group Ltd Liability Company
Progress in Mine Safety Science and Engineering II - Proceedings of the 2nd International Symposium of Mine Safety Science and Engineering | Year: 2014

Through the linear elasticity character of the rock stress-strain curve under the uniaxial compression test, the paper analyzes the elastic plastic behavior and the damage evolution equation of the ingredient, it shows that the stress is power function of the elastic strain in the process of loading and the stress relief, the ingredient is nonlinear elasticity. It focuses on the relationship among the elastic model, the plastic strain and the damage, then it draws a clear conclusion that there is correlation between the elasticity coefficient and the damage consume energy as well as the power function relationship between the plastic strain and the damage existence, the mechanical energy of the ingredient is obtained in the loading cycle accompany with hysteresis which is caused by interior friction. Finally established the damage evolution equation of non-linear module and the constitutive equation, the mathematical relationship of the elastic modulus and damage is built too. © 2014 Taylor & Francis Group. Source

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